When in doubt as to
which size to use, ALWAYS go to the next Larger Size Heater. Remember to
take other conditions into consideration when determining the proper size heater
for your pool. These include:

Did
you know that a scale build-up of "just" one sheet of paper thickness can
increase your heating costs by 10%! Prevent scale formation through
proper pool water chemistry & the use of
BioGuard Scale Inhibitor.